From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1RIQmV-0001IJ-Sm for garchives@archives.gentoo.org; Mon, 24 Oct 2011 20:06:03 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id B1E5D21C14E; Mon, 24 Oct 2011 20:05:34 +0000 (UTC) Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by pigeon.gentoo.org (Postfix) with ESMTP id DC0AE21C13A for ; Mon, 24 Oct 2011 20:03:11 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp.gentoo.org (Postfix) with ESMTP id 64DCF1B402C for ; Mon, 24 Oct 2011 20:03:11 +0000 (UTC) X-Virus-Scanned: by amavisd-new using ClamAV at gentoo.org X-Spam-Score: -4.012 X-Spam-Level: X-Spam-Status: No, score=-4.012 required=5.5 tests=[AWL=-0.220, BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FREEMAIL_FROM=0.001, NML_ADSP_CUSTOM_MED=0.9, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-0.504, T_TO_NO_BRKTS_FREEMAIL=0.01] Received: from smtp.gentoo.org ([127.0.0.1]) by localhost (smtp.gentoo.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id siLuoKOZUhD2 for ; Mon, 24 Oct 2011 20:03:05 +0000 (UTC) Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) by smtp.gentoo.org (Postfix) with ESMTP id E32F41B4015 for ; Mon, 24 Oct 2011 20:03:02 +0000 (UTC) Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1RIQjc-0004p4-IS for gentoo-user@gentoo.org; Mon, 24 Oct 2011 22:03:00 +0200 Received: from dsl.comtrol.com ([64.122.56.22]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 24 Oct 2011 22:03:00 +0200 Received: from grant.b.edwards by dsl.comtrol.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 24 Oct 2011 22:03:00 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: gentoo-user@lists.gentoo.org From: Grant Edwards Subject: [gentoo-user] Re: [OT] Disappointing USB3 performance Date: Mon, 24 Oct 2011 20:02:45 +0000 (UTC) Message-ID: References: Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: dsl.comtrol.com User-Agent: slrn/pre0.9.9-102 (Linux) X-Archives-Salt: X-Archives-Hash: 534fa52c3fc07e1869d8f490d3f12ed1 On 2011-10-24, walt wrote: > I just bought an add-on USB3 adapter and outboard USB3/sata docking > station, and I've been comparing the performance with my old e-sata > outboard docking station. Not so good :( > > After getting some unreliable results with hdparm, I settled on > copying one 3GB file from one partition of the outboard drive to > another partition of the same drive. These results are highly > reproducible, and favor e-sata over USB3 by a large margin. > > Over at least six trials on each docking station I consistently get > 105 seconds for USB and 84 seconds for e-sata, a 5:4 ratio in favor > of e-sata. Not surprising. Did you expect that adding a gateway device to the communication path and another protocol layer on top of SATA would make things faster? > I used the same hard disk and the same pci-e slot in the same > minimally-loaded machine for all the runs, and got very consistent > results every time. > > Basically, the USB3/sata docking station gets the same throughput as > the older sata 1 drives connected to the onboard pci sata controller, > which is still pretty respectable for an outboard drive, I think. Yep, SATA performs the same as SATA. AFAIK, eSATA and SATA are identical apart from the physical specs for the connector, a few minor voltage level differences (to imporove noise tolerance), and hot-plug support. > So, has anyone out there done similar tests on USB3 drives yet? There are disk drives that talk USB3 natively and aren't just using USB<->SATA gateways? -- Grant Edwards grant.b.edwards Yow! How many retured at bricklayers from FLORIDA gmail.com are out purchasing PENCIL SHARPENERS right NOW??